package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.aop.framework.AopContext;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;

    @Resource
    private RedisIdWorker redisIdWorker;
    /**
     * 秒杀优惠券
     * @param voucherId
     * @return
     */

    @Override
    public Result seckillVoucher(Long voucherId) {
        //1,查询优惠卷
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        //2,判断秒杀是否开始
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            //尚未开始
            return Result.fail("秒杀尚未开始");
        }
        //3,判断秒杀是否结束
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            //已结束
            return Result.fail("秒杀已结束");
        }
        //4,判断库存是否充足
        if (voucher.getStock() < 1) {
            //库存不足
            return Result.fail("库存不足");
        }
        //7,返回订单id
        Long userId = UserHolder.getUser().getId();
        synchronized (userId.toString().intern()) {
            IVoucherOrderService proxy = (IVoucherOrderService)AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        }
    }
    @Transactional
    public  Result createVoucherOrder(Long voucherId) {
        //一人一单
        Long userId = UserHolder.getUser().getId();
            //查询订单
            int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
            //判断是否存在
            if (count > 0) {
                //用户已经购买过
                return Result.fail("用户已经购买过");
            }
            //5,扣减库存
            boolean success = seckillVoucherService.update()
                    .setSql("stock = stock - 1")
                    .eq("voucher_id", voucherId)
                    .gt("stock", 0)
                    .update();
            if (!success)
                return Result.fail("库存不足");
            //6,创建订单
            VoucherOrder voucherOrder = new VoucherOrder();
            //6.1.订单ID
            long orederId = redisIdWorker.nextId("order");
            voucherOrder.setId(orederId);
            //6.2.用户ID
            voucherOrder.setUserId(userId);
            //6.3.代金券ID
            voucherOrder.setVoucherId(voucherId);
            save(voucherOrder);
            return Result.ok(orederId);

    }
}
